Updated mediawiki/extensions
Project: mediawiki/extensions/SemanticForms  a135cdfbe830f672de53f605f7a949689e317b46
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Use SpecialPageFactory::getPage

Change-Id: I8b50a0183978649b955bbaa4b76eaf24e130022f
SpecialPage::getPage is deprecated in 1.18. Replacement was added in 1.17.